OLXxiii. GRAMiNE^. (J. D. Hooker.) 5 



Spilcelets 2-3-nate, in a simple spike, gl. I with tuber- 



cliid penioillate ribs 50. EiionueuS. 



Spikelets solitary, terminating the branches of a thyrsoid 



panicle . . ; 51. Cleistachne. 



Spikelets capitate, male sessile, 2-fld., forming an involu- 



criform whorl round the pedicelled fern. . .. . S2. Gbkmainia. 

 Spikelets 2.nate, or the uppermost 3-nate, spieate, or 



panicled .53. Andeopoqon. 



Spikelets in 2 superposed seriea ; upper series of hetero- 



gamous pairs, and a teiniinal male, lower a whorl of 



4 persistent males or neuters 54. Anthistieia. 



Spikelets as in AntMstiria, but male and neuter spikelets 



deciduous with the fern, j callus . . . .55. Iseilema. 



Seriea B. Poaceae. Spihehts continuous (not articulate with) their 

 pedicels, 1- many-fld. ; racdilla articulate at the base, and often between 

 the flg. gls. ; lowest 11. always fruiting, upper often male or neuter. 



Exceptions. Upper fl. alone bisexual in Phalaridece. Spilcelets articulate on 

 their pedicels, or gl. 1 and II separately deciduous occur in Alopecums, Melicn, 

 Fingerhuthia, Cyathopus, and Sphmrocaryon. — See under Fanicacece some genera 

 with spikelets inarticulate at the base. 



Tribe V. PHALAEiDE.a:. Spikelets with a terminal perfect fl., and one or 

 more imperfect male or neuter below it ; rachilla not produced beyond the 

 perfect fl. 



Panicle contracted or spiciform ; spikelets awnless . . 56. Phalabis. 

 Panicle spiciform ; gls. 6, III and IV neuter, awned; 



. stamens 2 57. ANTFOXANTHtTM. 



Panicle lax. ; gls. 6, III and IV male, awned or not . 58. HiEKOOiiLOA. 



Subtribe VI. AGKOSTiDBa. Spikelets 1-fld. ; rachilla jointed at the 

 base, produced or not beyond the flg. gl. ; gls. 3, I and II empty. III 

 flg. awned. 



Exceptions. BpiTcelets sometimes 2-fld. in Sporoholus and MueJilenhergia. 



Subtribe I. Stipe*. Spikelets paniicled ; rachilla not produced beyond 

 gl. Ill ; fl. gl. rigid or hard, awned (except Milium,). 



61. Ill narrow, awn 3-fld 59. Aeistida. 



Gl. Ill narrow, awn entire, grain terete .... 60. Stipa. 



Gl. Ill broader, awn entire, grain dorsally compressed . 61. Oeyzopsis. 



Gl. Ill obpvoid, awn 0, grain oblong . . . .62. Milium. 



Subtribe II. PHLEOiDBiE. Spikelets in spiciform or subspiciform panicles, 

 gl. Ill hyaline, loosely wrapping the grain; stigmas exserted from the 

 top of the spikelet. 



* Machilla produced heyond the flg. gl. 



Gl. I and II shorter than III 63. Hel'eochloa. 



Gl. I and II longer than HI 64. Phleum. 



** Bachilla not produced. 

 Gl. I and II longer than HI ; panicle cylindric . . 65. Alopecue0S. 

 Gl. I and II minute ; panicle laxly subspiciform . . 66. Phippsia. 



Subtribe III. Eua&koste^. Spikelets usually small, in open or con- 

 tracted many-fld. panicles; gls. usually thin or membranous; stijiinas 

 laterally exserted from the spikelet. Spikelets rarely 2-fld. in Sporobolus 

 and Muehlenbergia. 



